Lock nut



April 23, 1929. J M SHORT 1,710,117

LOCK NUT Filed Oct. 21, 1927 HTTURNEY Patented Apr. 23, 1929.

UNITED STATES JOHN M. SHORT, F WHEELING, WEST VIRGINIA.

Loci: mar.

Application filed October 21, 1927. Serial No. 227,782.

This invention relates to improvements in look nuts, and it has for its primary object to provide a simple and eflicient nut of the so-called self-locking type which, following application, is positively held against chance retraction, and which, when occasion requires, may readily be removed.

In describing the invention in detail, reference is herein had to the accompanying drawings, in which' Figure 1 is a side elevation of the invention;

Figure 2 is an outer face view of the same; V

Figure 3 is a cross section of the nut on line 33, Fig. 2; and- Figure 4- is an enlarged perspective view of'the pawl, detached. Referring to said drawings, 1 designates a threaded bolt which has therein one or more longitudinal thread-intersecting channels 2. Screwed upon said bolt is a nut 3, herein shown as rectangular in form, which has a pawl 4 pivotally mounted in a recess 5 provided therefor in a corner portionof the outer face of the nut. Said recess opens at its inner end into the threaded bore 6 of the nut, as' is shown in Figs. 2 and 3, thus to permit the point of the pawl to occupy a0 a position wherein it may ride upon the threads of the bolt as the nut is rotated in a forward direction and wherein it will abut against the upright wall of one of the channels 2 of the bolt for preventing chance retraction of the 'nut.

The inner end wall of the recess 5 is located in a radial line which intersects one side of the nut approximately in the midlength thereof. The opposite end of the re- 40 cess, which is of relatively slight width,

opens outward through side of the nut, as shown. The pawl 4 substantially corre- 4 sponds in form with that of said recess and hasits outer end mounted on a pivot-pin 7 which extends parallel to the face of the nut and which has its point permanently fixed in the nut.

The point of the pawl has a width at least equal to the width of the thread employed on the bolt and is, therefore, provided with one or more grooves 8, as shown in Figs. 3

and 4, adapted conformably to embrace such bolt thread or threads. I

The pawl has sufiicient play upon its pivotal-mounting that it is permitted a slight radial movement at its inner end. Therefore, as the nut is rotated forwardly upon the bolt, the point of the pawl rides over the bolt threads between the channels 2 and drops into the successive channels as the latter pass thereunder. Manifestly, chance retraction of the nut is prevented by interengagement of the point of the pawl with the rear wall of the channel2. I lVhen, for any reason, it is desired 'to remove the nut from its bolt, the pawl may be swung from the position in which its point is disposed in one of the channels to a position in which it substantially parallels the bolt, as shown in broken lines in Figs. 1 and 3. Such swinging movement of the pawl is positively prevented, however, when the latter is interengaged with the bolt threads. What is claimed is In a nut look, a bolt having a lon 'itudinal thread-'nterse'cting channel, a nut having a recess formed in its outer face, which opens into the bore of the nut, a'pawl dis osed in said recess and having a point exten ing outwardly at an angle to the under face of the pawl and engageable in the channel of the bolt, and a pivot for the pawl rigidly fixed in the nut and having its axis parallel to the face of the nut and loosely-fitting its bearing in the pawl so as to allow the pawl to be swung longitudinally of the bolt to lie bodily beyond the outer face of the nut, and to be also rocked laterally of the bolt so as to cause its said point to be moved radially of the bolt and out of the channel of the bolt.

In testimony whereof, I afiix my signature.

JOHN M. SHORT. 

